odd voltage problem..help

[jmd2914]

Im running a 3g alt with a taurus fan on a toggle switch. when i first start the car until it is warmed up the voltage will be almost all the way at the top of the meter and the amp light will be flickering. it seems like the only way i can keep the voltage down is by turning on the fan, even if the car isnt warm. also when the car is just idling its fine but when im actually driving thats why the voltage spikes. this started about a week ago. any ideas?

thanks

J

 

[smithin813]

Have you checked the volage regulator? I had the same problem a while back with my 3g and it was that.

 

[HISSIN50]

Agreed. Be careful that you dont start blowing light bulbs, etc.

It takes 2 mins to swap a 3G reg once you have the alt off the car.

 

[jmd2914]

how do i check//change the voltage regulator? ive never had to do it

 

[HISSIN50]

If you're seeing voltage over 15V for about any reason, chances are the reg is bad. A parts store can bench test the alt. The kicker is finding a decent reg, let alone locally. I'm still trying to find decent ones that are not real pricey.

 

[jmd2914]

is the voltage reg on a 3g internal? if so, can i still swap it out? or would i be better off just buying a new alt.

 

[HISSIN50]

is the voltage reg on a 3g internal? if so, can i still swap it out? or would i be better off just buying a new alt.

It takes 2 mins to swap a 3G reg once you have the alt off the car.

You need torx bits, a paperclip, and a couple minutes.

Ford Fuel Injection 3G Alternator Voltage Regulator Replacement

 

[jmd2914]

awesome thanks for the write up, can i get a new reg at kragen//autozone? or is it more of a specialty part?